Here is a post from the Nintendo website that lets you know what this error code means and how to fix it:
Error Code: 84020
Nintendo Wi-Fi Connection match making service is undergoing temporary
maintenance. This maintenance can prevent certain games from matching up
opponents. Please try your connection again later
If you have waited several hours but are still receiving this error when connecting, please see the information below:
This error is typically caused by a
firewall interfering with a successful connection to the Nintendo WFC.
Please read the following information.
- Do you receive this error every time you try and connect?
In order to solve this problem, you may consider adjusting your
router's Port Forwarding settings*. Each router is unique, so consult
the owner's manual for your router or contact the manufacturer for
specific information on working with your router's ports. For your
- If you receive this error every time, please proceed to step #2 on this page.
- If you receive this error only when playing a particular friend,
then it is likely a problem with the friend's firewall settings on their
connection. If possible, tell your friend review the port forwarding
instructions on this page.
- If you are prompted for a device or profile name, you can enter anything you like (such as Wii, etc.).
- The starting port to open is 1, the ending port to open is 65535 (or as high as the router will allow).
- Protocols will need to be set to UDP only.
- Set the IP address for the ports to forward to the same as the Wii?s
static IP address. If you don't know what the Wii's IP address is, the
best way to determine it is by performing a manual setup:
How to manually configure the Wii's IP address:
The first thing you'll need to do is find out what IP address range you should be using. To do this:
- Click the "Start" button in the lower left-hand corner of your computer.
- Next, you will need to access the command prompt. To do this:
Type "cmd" into the box and press Enter.
Type "IPCONFIG/ALL" and press Enter. The IP address, Subnet Mask, Default Gateway, and DNS servers of the PC will be displayed.
- Windows XP users click "Run."
- Windows Vista users click inside the search bar.
The IP address you are going to assign to the Wii must be 10 digits
higher than the PC's. (e.g., 192.168.1.100 becomes 192.168.1.110). The
Wii and the PC must have different IP addresses. Make note of what IP
address you will assign to the Wii.
Enter in the exact same values for your Subnet Mask, Default Gateway,
Primary DNS and Secondary DNS. They must be the same for your Wii
console and for your PC.
You will now need to manually assign this new IP address to your Wii
console. For step-by-step instructions on how to do this, please click here.
Ensure your router has the latest firmware installed. Visit your
router manufacturer's website and look for any updated firmware that may
be available (these are typically found under "downloads" or by
searching for your particular model number).
The error may be caused by a basic setting on the router that needs to be adjusted (such as the channel). Please review our general router troubleshooting.
- After you perform the manual setup, the Wii will initiate a
connection test. If the connection tests fails, then please review the
values you entered. If you still cannot complete the manual setup,
please give us a call at 1-800-255-3700 in the USA or Canada for
If you have tried all of the steps above with no success, we would
like to speak with you directly. At your earliest convenience, please
call 1-800-255-3700. Our representatives are available between 6:00
a.m. and 7:00 p.m. Pacific Time, seven days a week.
*While Nintendo provides this information for our consumers' use, it
is up to each consumer to determine what security needs they have for
their own networks, and to decide how best to configure their network
settings to meet those needs.
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